251650061 has 32 divisors (see below), whose sum is σ = 297749760. Its totient is φ = 211159872.

The previous prime is 251650051. The next prime is 251650097. The reversal of 251650061 is 160056152.

It is a de Polignac number, because none of the positive numbers 2^k-251650061 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a taxicab number since it can be written as a sum of two cubes in more than one way. Here 251650061 = 230³ + 621³ = 437³ + 552³.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 251650061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251650001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5852306 + ... + 5852348.

It is an arithmetic number, because the mean of its divisors is an integer number (9304680).

Almost surely, 2^251650061 is an apocalyptic number.

It is an amenable number.

251650061 is a deficient number, since it is larger than the sum of its proper divisors (46099699).

251650061 is an equidigital number, since it uses as much as digits as its factorization.

251650061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 251650061 is about 15863.4819948207. The cubic root of 251650061 is about 631.3434512367.

The spelling of 251650061 in words is "two hundred fifty-one million, six hundred fifty thousand, sixty-one".